300 WSM--Need Your Data for Cartridge Guide

I'm a High Power Long Range shooter. I use 58.0 gr. of H4350, CCI BR2 primer, Win. case, and a 220 gr. Sierra bullet soft seated. Rifle is a Remington 40X solid bottom in a Master Class prone stock with a 30" Krieger 1:9" twist bbl. I managed a 199-9X in the Wimbledon Cup at Camp Perry in 2006 including a 100-7X on the first string.

The excellent metal work was done by Warner Tool Co., and the excellent stock work was done by Alex Sitman at Master Class Stocks.

66.5 grains of H4831 with a 210 Gr Sierra HPBT MK was giving about 2850 FPS at the muzzle and grouping in the 6 inch range. vertical was a bit flatter than this. Although the wind was holding pretty steady, I did get caught in a few changes that I ignored when measuring the group.
At 300 yards this group measured about .8", just over a 1/4 MOA, my best group to date. ES when chrony'd was +/- 8 FPS from average.

Gun is a Tikka T3 with 26" heavy profile rock creek barrel. Looking to get a 30" true-flite in the fall

Good thread as I am just starting to get into reloading for my .300 wsm with a 26" 1 in 10" heavy barrel. Trying to decide what bullet weight to use. I want a good range load as 98% of my shooting is long distance at the range. I also want to be able to take this load hunting once or twice a year. I am thinking about the berger 210 match hunting VLD for its higher bc which should help in the wind. How would the heavier bullet affect barrel life? Any suggestions? When will this guide be ready?

DAZZH - 74mm is 2.920", factory max. OAL is 2.860". My new build in 7mmWSM is finished - just waiting to go to the range for load testing, (Friday morning I hope) but mine are at 2.941" which is 10thou from the lands. I did fire one test round of 63.5gr AR2213sc OAL 2.860" with no obvious problems.

This round is the most accurate I found so far in my plain ol' weatherby. It puts 5 shots into a quarter sized hole at 100 yards.

I've also had good luck with this load:
Reloader 19 - 70.4gr
125gr Nosler Ballistic Tip
CCI 250
Winchester brass
about 3200 fps
It spreads just a bit horizontally but the vertical spread is nearly zero at 100 yards.

Interestingly, nosler 180 grains shoot exactly the same at 100 yards as the 125's do. Weird, I know

I have a Rem. Titanium 300 wsm 24"bbl 1 in 10 twist stock bbl. Had some minor gunsmithing done to it a little for accuracy but more for lightening as its a sheep gun. It only weighs 7lbs scope and all. Just getting started into the reloading world and was wondering if anyone on here could help me out. I've been shooting 165gr Barnes vor-tex factory ammo. It shoots a 1" group at 200 and 8" at 700yds. I bought some Barnes tsx hpbt bullets to start with just not sure what to go with for powder, primers, AOL's and so on. I was going to use these factory fire formed brass? The reloading manual i have doesnt have this bullet type listed. I didn't see anybody using these bullets in 165gr on here so might go with something else next time but need to use them up. Any info would be greatly appreciated. Thanks and good shooting.

Hi guys, Im about to start load testing a McGowen 30" SS BB in a Savage 12 target action. Im going to be trying 230g Berger Hybrids though there are no loads concerning them here.
I'm looking to use AR2213sc which is the same as your Hodgdon H4831.

I'm shooting Berger 230 Hybrids in .300 WSM. The chamber has a .280" freebore, allowing seating long enough to clear the neck-shoulder junction. Cartridge OAL is 3.260, which represents a .015" jump. Brass is Norma .270 WSM necked up in two steps and turned to .012" wall thickness. This provides a .3325 loaded neck diameter and .0045" diametral clearance in a Ã˜.337" chamber. The barrel is Ã˜1.25 straight and 34" long, primarily for weight. Action is a BAT 3LL147OCTPIC installed in a Manners Composite F-Class stock. [br]
Best load, so far, is 68.7 grains of IMR 7828 SSC over TulAmmo (Russian) KVB-7 LR primers. Instrumental velocity at 15' is 2941 fps. Adding approximately 6 fps provides a corrected muzzle velocity of 2947 fps. The primer edges are still round with some flattening in the center. I believe this is a full pressure load within SAAMI specs. There are no other pressure signs. The load shoots well, as seen in the attached target. The last shot, of course, is the one I pulled. Even in a rifle that weighs almost 22 pounds, this load has a lot of recoil. Proceed with caution.

Attached Files:

I am working up a load with 7828, because that is all I could find in a 8# Jug.
Fed 215 M primers
Remington brass, turned to .335 loaded round in a 338 neck chamber. 208 Hornady match
Seated just touching at 3.08
Douglas 1-10 twist 30â€ with brake.

Shooting from a wooden table At 500 M. One wind flag at 385 Its always windy here in Kingman AZ
Thatâ€™s my excuse for the horizontal and I am sticking to it.
Seams to have a forgiving sweet spot as the target would indicate

Attached Files:

I'm shooting a clunker small shank savage 300 wsm "cardinal Sin". 30inch Criterion 10 twist bull that wad a 308 barrel for about 15 shots. I shoot 200 gr smk with 72 grains if H1000 with wolf lrm primers and its a hammer. I have it in a master class stock and a Sightron SIII 10/50/60 FINE crosshairs. it does shoot really well I also will be trying N170 tomorrow with the 208 and heavier. I havent tried 4831 but ill try that soon also. I will be getting a muzzle break soon just to make it more pleasurable to shoot

MY QUESTION IS. WILL THE 12 TWIST DO ANYTHING THE 10 TWIST CAN I'D LIKE TO GET RID OF ONE JUST UNSURE WHICH

I'm shooting a clunker small shank savage 300 wsm "cardinal Sin". 30inch Criterion 10 twist bull that wad a 308 barrel for about 15 shots. I shoot 200 gr smk with 72 grains if H1000 with wolf lrm primers and its a hammer. I have it in a master class stock and a Sightron SIII 10/50/60 FINE crosshairs. it does shoot really well I also will be trying N170 tomorrow with the 208 and heavier. I havent tried 4831 but ill try that soon also. I will be getting a muzzle break soon just to make it more pleasurable to shoot

MY QUESTION IS. WILL THE 12 TWIST DO ANYTHING THE 10 TWIST CAN I'D LIKE TO GET RID OF ONE JUST UNSURE WHICH

Click to expand...

[br]
The answer is no, a 10" twist will stabilize the heaviest bullets at .300 WSM velocities. A 12" twist is only good up to medium weight bullets. I have a 10" twist .308 tactical rifle that shoots Berger 155.5 Fullbores very well. Stick with the 10" twist.

This is the load that I cooked up for my buddy's Savage 300 WSM: 200-grain Nosler Partition, 67 grains of IMR7828ssc, CCI mag primers, COAL 2.815 (Nosler specs). Sub-minute shooter at 100. He was dinging gongs at 1000. Not chrono'd, but should be about 2850.

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